Gila Limestone Member
Lithostratigraphy: McLeansboro Group >>Mattoon Formation >>Gila Limestone Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Virgilian Series
Allostratigraphy: Absaroka Sequence
Primary source
Willman, H. B., Elwood Atherton, T. C. Buschbach, Charles Collinson, John C. Frye, M. E. Hopkins, Jerry A. Lineback, and Jack A. Simon, 1975, Handbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p.
Contributing author(s)
M. E. Hopkins and J. A. Simon
Name
Original description
The Gila Limestone Member of the Mattoon Formation (Newton and Weller, 1937, p. 27).
Derivation
Named for Gila, Jasper County.
Other names
History/background
Type section
Type location
The type section consists of exposures about 1.5 miles south of Gila along Mint Creek (NE SW 31, 8N-9E) (Kosanke et al., 1960, p. 41, 51, 78, 79).
Type author(s)
Type status
Reference section
Reference location
Reference author(s)
Reference status
Stratigraphic relationships
Extent and thickness
The Gila has not been recognized outside the type area, where it is a gray, fine-grained, dense limestone 2.5 inches thick.
Lithology
Core(s)
Photograph(s)
Contacts
Well log characteristics
Fossils
Fish scales and teeth are the only fossils found.
Age and correlation
Environments of deposition
Economic importance
Remarks
References
KOSANKE, R. M., J. A. SIMON, H. R. WANLESS, and H. B. WILLMAN, 1960, Classification of the Pennsylvanian strata of Illinois: Illinois State Geological Survey Report of Investigations 214, 84 p.
NEWTON, W. A., and J. M. WELLER, 1937, Stratigraphic studies of Pennsylvanian outcrops in part of southeastern Illinois: Illinois State Geological Survey Report of Investigations 45, 31 p.
ISGS Codes
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